I pulled open my Sony DSC-N2 yesterday. I located and removed the IR filter which is opaque to infrared yet is transparent to visible light (greenish-blue piece of glass). I then replaced it with a piece of material that is transparent to infrared, but opaque to visible light (black square). This new filter I created using a window from an old television remote control which the William Temple House was kind enough to give me for free.
IR images are in this gallery.